Malicious PDF — malware analysis report

Static analysis result for SHA-256 621d3e64aaeeb108…

MALICIOUS

PDF

69.9 KB Created: 2021-03-01 20:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5c551931da5f118e1051cf0e0e0bf3c7 SHA-1: 4736c2b92de77e391303883afb5181cd64e85d7a SHA-256: 621d3e64aaeeb108c53b89f10ce6a101efe68bbe00f80861adb93dc70fbb50b2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs pointing to known malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though obfuscated, contains keywords related to 'T mobile personal cellspot signal booster', aligning with a phishing or social engineering lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/award?keyword=t+mobile+personal+cellspot+signal+booster In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_600e3f493b9e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5fe4c5b96d881.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/42703907623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_60110fc358513.pdfIn PDF document text
    • http://xojakipizixa.22web.org/42584418681.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/wirorisixuboposetujat.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/xbox_live_fehler_8015d002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500201/normal_5feb47e567d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_5fd396b64aae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fe63603784fc.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/alaska_drivers_license_tracking.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujoxamafo.epizy.com/accident_report_nj_parkway.pdfIn PDF document text
    • http://xetoluwe.epizy.com/jagufaxof.pdfIn PDF document text
    • http://muzubosumewuxem.epizy.com/binaural_beats_for_meditation.pdfIn PDF document text
    • http://kaderuzaxaje.rf.gd/beethoven_piano_sonata_14.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/53699920600.pdfIn PDF document text
    • http://towilisok.epizy.com/lakutilomifanisazijore.pdfIn PDF document text
    • http://kilisajafe.rf.gd/how_to_connect_printer_to_wifi_hp_deskjet_2652.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 5340 bytes
SHA-256: 18cf151e06b4666c4f22016e530777b5ccbde677d1dc7e3217a7866b92498105
font_01_sfnt_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 10644 bytes
SHA-256: 2473878044b26a18d4120a6ef7a13ca39ff61b48c0670b49d8d01d1714b8f2eb

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